Internal exhaust valve increases down stroke speed.
内部排气阀增加下冲速度。
To keep the same speed, the swimmer had to shorten their stroke.
为保持速度，游泳者不得不较少划距。
After his father's stroke in 2008, however, his grooming as heir picked up speed.
在他父亲于2008年中风，然而，他的培养作为继承人加快。
After his father's stroke in 2008, however, his grooming as heir picked up speed.
在他父亲于2008年中风，然而，他的培养作为继承人加快。
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